Journal
ASTROPHYSICAL JOURNAL
Volume 539, Issue 2, Pages 658-674Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/309263
Keywords
galaxies : distances and redshifts; galaxies : individual (M88); supernovae : general; supernovae : individual (SN 1998bu)
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From an analysis of SNe 1972E, 1980N, 1981B, 1981D, 1983R, 1998bu, 1999cl, and 1999cp, we find that the intrinsic V-K colors of Type Ia SNe of typical luminosity (i.e., with multicolor light-curve shape (MLCS) parameter -0.4 less than or similar to Delta less than or similar to +0.2 mag) suggest a uniform color curve. V-K colors become bluer linearly with time from roughly one week before B-band maximum until one week after maximum, after which they redden linearly until four weeks after maximum. V-H colors exhibit very similar color evolution. V-J colors exhibit slightly more complex evolution, with greater scatter. The existence of V-near-infrared (NIR) color relations allows the construction of near-infrared light-curve templates that are an improvement on those of Elias et al. from 1985. We provide optical BVRI and infrared JHK: photometry of the Type Ia supernovae 1999aa, 1999cl, and 1999cp. SN 1999aa is an overluminous slow decliner (with Delta = -0.47 mag). SN 1999cp is a moderately bright SN unreddened in its host. SN 1999cl is extremely reddened in its host. The V-NIR colors of SN 1999cl yield A(V) = 2.01 +/- 0.11 mag. This leads to a distance for its host galaxy (M88) in agreement with other distance measurements for members of the Virgo Cluster.
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